@article{DAN_1977_233_4_a3,
     author = {A. V. Dmitruk},
     title = {Quadratic conditions for a weak minimum for singular regimes in optimal control problems},
     journal = {Doklady Akademii Nauk},
     pages = {523--526},
     publisher = {mathdoc},
     volume = {233},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_4_a3/}
}